related subject - two level aquifer
the best way i found was to collapse a few levels into dry stone and go below that
map would look like this
--
@@@######### <start point @= dry stone
@@@######### <#= damp stone/loamy
############
############
############
###@@@######
###@@@###### <finish point with dry stones surrounded by damp
--
@@@#########
@@<######### <stairwell from surface
##+######### <tunnels through damp stone
##+#########
##+#########
##+++@###### <entering dry stone
###@>@###### <stairs down to dry level
--
the level above is also damp so it will cause water to flow into your stairwells
--
@@@#########
@@>######### <down stairs to level below
############
############
############
###___######
###_#_###### <channels from level above to surface
--
to make a tunnel through aquifers start with a 1x6 entrance
#####
#___#
#_+_#
#_+_#
#_+_# <+ is floor through tunnel
#_+_# <_ is a channel full of water
#####
i did manage to get a collapse into the aquifer similar to this
--
##_+_##
___%___
_##%##_ <tunnel
_##%##_ <%= bridge (incase problem) no channel
_#>>>#_ <dry stairwell
_##>##_ <#= dry stone
_#####_
_______
i ended up abandoning the human settlement that i was attempting to collapse after reaching the aquifer gold mine of dry stones
every level below was dry and lustrious but the framerate of all that water was harshing my buzz
****i think you can expand on that pretty well